With the new introduction of Xmarks (formerly Foxmarks), new features have been added. One of the new feature sets is the discover-ability enhancements. These things allow you to discover sites like the one you’re viewing. One part of the new discover-ability features is the info icon that sits next to the bookmark star icon in the address bar.
Xmarks Info Icon in Firefox Address Bar
If you don’t want to see that Xmarks Info Icon anymore, you can easily remove it by going to Tools, Xmarks, Xmarks Settings. Once you see the new preferences window appear, click on Discovery. Once there, you’ll notice settings for Smart Search, Enable Site Info and Suggested Tips. You’ll want to uncheck the Enable Site Info checkbox. That should remove the info icon from the address bar.
If for some reason you still want quick access to the information the info icon used to give you, you can always right click right above the address bar and go to customize. Then look for the info button and drag to some place on the Firefox chrome and you’re good to go.
Please, add-ons, leave the Address bar interface alone.